Technology Development

Iron-Making / Blast furnace

Development of the technology of the system to measure pig iron of tap hole in blast furnace (BIMS)

A blast furnace is used to put iron ore in a furnace to make melted iron for casting. In the operation of a blast furnace, the temperature of pig iron is a critical factor to determine quality of steel. The purposes of the development of this system are to measure the temperature of the tap hole of the blast furnace in a non-contact way in real time in order to monitor surroundings, to display the measured real-time temperature data after being program ed, to find the temperature of pig iron by extracting and programming the data in a particular area with an optimal algorithm, to estimate the temperature condition of pig iron in the blast furnace, and thereby to improve a rate of operation and save cost price.

Installation of a thermal imaging camera – Image of camera measurement

The system supports non-contact measurement according to a change in the tap hole of blast furnace, checking frequently the temperature of the pig iron in the furnace installed 6M away from the tap hole. Expectancy effects: improved operation efficiency [Si] and cost saving [consumable-type T/C] by shortening the measurement time of the temperature of pig iron
The real-time measurement of temperature makes it possible to find the temperature of the pig iron emitted by the tap hole on line. Therefore, at the beginning, it is possible to check the temperature of pig iron without investing as much fuel cost [COKE] as the calorie equivalent to a runner’s loss.

Steel-Making

Development of KR based Ladle Top Bubbling Device System

urrent State & Problems

Both Skimmer Plate based Skimming Work and Bottom Bubbling are applied to remove slag as an impurity floating on the top of KR Ladle. In the process, Bottom Bubbling has the following problems:

1. There is the risk of pig iron leak accident if porous plug is abnormal or worn out.

2. It costs high to repair and repair the ladle. (The cost for replacing ladle brick due to worn-out porous plug)

Improvements

Changed from Porous Plug based Bottom Bubbling to Lance based Top Bubbling.

Free of the risk for pig iron leak

Shortened stroke distance of skimmer (shortened skimming time, and longer life span)

Improved bubbling effect by adjustable N2 pressure

Steel-Making / Continuous Casting

Localization of Manifold Block of 4-side Scrarfer of Slab Correction Line of POSCO Gwangyang Continuous Casting Factory.

Before improvement (import)

Supplying Horizontal Manifold costs high and takes long, since it a foreign resource needs to be imported. It is impossible to respond immediately to an unexpected accident. Piston Rod Assembly used currently prevents the gas leak in the Manifold and in a transfer section. Friction with Piston Head causes Gaskets to worn out, leading to gas leak. In addition, frequent damage to the Head makes it difficult to maintain the equipment. There is the high risk of gas explosion at work. For these reasons, it is necessary to make structural improvements and save cost price through localization.

After improvement (localization)

Localization of imported product / Piston Head improvement in consideration of efficiency and stability
Piston Head welding part Upgrade to the movable head structure to prevent piston head separation caused by deformation and abrasion
Piston Head part Add Slot Oxygen Line to Piston head on the top in order to improve scarfing quality (the bottom excluded)
Body part Improvements in thickness for the prevention of thermal deformation and the application of Schedule Pipe
Guide Roller Improvements in the roller shape and rail part for preventing the (forward/backward) guide roller from being separated in use / Addition of grease nozzle
Guide Roller Bracket Improvement in the guide roller bracket to prevent cracks and deformation (welding type -> integration type)

Steel-Making

Improvements in desulfurization efficiency and refining yield by applying SNNC Electric Furnace Ladle B/Bubbling System

Current State & Problems

Dead zone in the bottom of ladle leads to adhesion of lump metal. As a result, it is required to change refractory materials often. Such replacement also causes a rise in the price cost for production.( Since there is no Bottom bubbling function, LF treatment severely causes local erosion of Slag Line.)

Improvements

The system is used to inject Ar or N₂GAS in Ladle to adjust the temperature of the ladle or molten steel.
It is composed of Automatic Coupler for remodeling, attaching, and automatically coupling the ladle coupling part, and Valve Stand & Control Panel for utility supply and control.

Effects

Molten steel stirring effect to prevent the lump steel of slag on the bottom of ladle from being piled up Early development of the technology to manufacture unique and premium steel in an innovative process and the establishment of a stable manufacturing system. Bottom Bubbling operation for securing a worker’s safety, shortening a process time, and increasing an operating rate.

Rolling / Hot rolling / Cold rolling

Development of Steel Band Forming System for Coil

Development of Steel Band Forming Device & System

Current State & Problems

The coil wound up completely is automatically welded to the overlay part of Steel Band in order for the connection and binding of the steel band inserted by Auto Bending Machine. After that, the steel band is cut and packed.

The coil packed completely is transported to a purchaser after being sold. For the use of the coil, the welded steel band is removed. In this case, the cutting device or cutter for steel band is forced to be put in between the steel band bond with the coil, and the is cut.
In such a process, the blade of the cutter causes scratches or damage not only to the package but on the surface of the coil, which generate any defect of the coil. As a result, a large amount of coil fails to be used and is wasted.
Given customer inconvenience and voice of customer (VOC), it is urgent to make improvements. (No space for cutting)

System development effects

1.Cutting without any damage to the coil surface
2. Quality improvement and cost saving by reduction in coil defects
3. Shortened cutting time and improved work efficiency (handling VOC)
4. Prevention of safety accident by an unskillful worker’s removal of steel band

Electro-plating

Pilot Electro-Plating Line 1LOT

pH value of Ni-Flash solution is 1.2-2.4 approximately (strong acid). Reduction in scattered pattern through the improvement in solution pH
The structural improvement in the nozzle of electrolytes makes it possible to supply electrolytes evenly without any mixture of the bubble layer in the plating tank, and to generate the uniform plating layer on the surface through the inhibition of the flow of electrolytes.

Plating tissue after Nozzle remodeling (no spotted pattern and compact plating tissue )

Coating Section / Zinc Coating / Cooling Tower

Continuous Galvanizing Line – Coating Section – Air Jet Cooler

With the naked eye, the cooling is processed in the form of crown, as shown in Fig. [1-1]. That is important for quality of steel plate. That is because it is hard to make the quality at the center and corner even in the crown-shaped cooling state, and because there is a large difference in the size of spangle.
JET-COOLER is used to lower the surface temperature of steel plate. Nevertheless, the first objective of the system is to change the crown-shaped cooling state to the one shown.

The cooling form by fluid flow [Analysis of complex cooling mechanism]
– Nusselt’s Number
It is the ratio of convective to conductive heat transfer at a boundary in a fluid. In this case, conductivity and convection current pass the same fluid layer.

Quality of steel plate: Spangle Size verified

1-22, Geumchon-gil, Okgok-myeon, Gwangyang-si, Jeollanam-do

Call : +82 61 – 772 – 7781 ~ 5
Fax : +82 61 – 772 – 7746

1-22, Geumchon-gil, Okgok-myeon, Gwangyang-si, Jeollanam-d

Call : +82 61 – 772 – 7781 ~ 5 Fax : +82 61 – 772 – 7746

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